James r



(No Model.)

- I J. R. VANCE.

STEAM BOILER.

No. 575,786. Patent-ed Jan. 26, 189?.

Witnesses. v Inveritor.

% Attorney.

m: Noam PEYEHS CO.PHOYO-L'YNU,WASH1NGTON, n c.

Nrrnn STATES PATENT OFFICE.

JAMES R. VANCE, OF GENEVA, NEIV YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 575,786, dated January 26, 1897.

Application filed November 1'7, 1896. Serial No. 612,406. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES R. VANCE, of Geneva, in the county of Ontario, in the State of New York, have invented new and useful Improvements in Steam-Boilers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to steam-boilers, and the object is to increase the efficiency of the boiler and to economize in fuel.

To this end my invention consists in the combination of a horizontal cylinder,a smaller horizontal cylinder concentric with and projecting from one end of the first cylinder, fire-tu bes extending through each cylinder, at

. chamber at one end of the large cylindercommunicating with all the tubes, one end of each of the tubes in the larger cylinder opening into the furnace, a chamber at the end of the smaller cylinder communicating with its tubes, and a chimney connected to the latter chamber; and my invention consists in certain other combinations of parts hereinafter described, and specifically set forth in the claims.

In the drawings hereto annexed and forming a part of this specification, Figure-.1 is a longitudinal sectional View of the boiler and furnace; and Fig. 2 is an end view of the boiler, looking toward the end having the small cylinder, the end of the latter cylinder being removed to show the interior clearly.

Referring specifically to the drawings, A is the large horizontal cylinder or shell of the boiler, and B is the smaller cylinder or shell, which is concentric with the cylinder A and extends from one end of the latter cylinder, to which it is riveted.

O is a partition near one end of the cylinder A, and O is a partition near one end of the cylinder B, which partitions serveto sup port the fire tubes or flues and form communicating passages for the heat and smoke between the outer and inner tubes and between the opposite ends of the inner tubes and the chimney Y, (indicated by broken lines.)

D D, &c., are the outer or short. tubes extending from the partition 0 to the end of the large cylinder, which tubes directly open into the furnace or fire-flue E below, and D Dare the long central tubes extending longitudinally through both cylinders and supported at their ends by the partitions Cand 0. The tubes D D are nearlytwice the length of the tubes D D, &c.

The grate F for the fire is preferably located below the large cylinder, but may be placed below the small cylinder if desired. The unfeathered arrows show clearly the path of the fire and smoke through the tubes and chambers at the ends of the boiler.

It will be obvious from an examination of the drawings that the fire first strikes the entire outer surfaces of both cylinders, then passes through the tubes D D, &c., to the chamber formed by the partitions O, and then back through the tubes D D, &c., to the chamber at the end of the small cylinder, where it passes up the chimney Y. By these means the boiler is thoroughly and equally heated at all points and therefore great efficiency is derived. This efficiency is increased by placing the cylinders in a horizontal position and placing the small cylinder concentric with the large cylinder and not to one side, which causes an unequal application of the heat. It is increased also by the inclined surface G of the flue E, which reflects the heat upward and helps to turn the products of combustion toward the open ends of the fire-tubes D D, &c.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a steamboiler, the combination of a horizontal cylinder, a smaller horizontal cylinder concentric with and projecting from one end of the first cylinder, fire-tubes extending through each cylinder, a chamber at one end of the large cylinder communicating with all the tubes, one end of each of the tubes in the larger cylinder opening into the furnace, and a chamber at the end of the smaller cylinder communicating with its tubes and the chimney, substantially as described and shown.

2. In a steam-boiler, the combination of a horizontal cylinder, a smaller horizontal cylinder concentric with the first cylinder and projecting from one end of the latter, said cylinders being of substantially the same length, the larger cylinder having substantially twice the diameter of the smaller cylinder, fire-tubes extending through each cylinder, a chamber at one end of the large cylinder communicating with all the tubes, one end of each of the tubes in the larger cylinder Opening into the furnace, and a chamber at the end of the smaller cylinder communicating with its tubes and the chimney, substantially as described and shown.

3. In a steam-boiler, the combination of a horizontal cylinder, a smaller horizontal cy1- inder joined to one end of the larger cylinder and concentric therewith, partitions O and C, fire-tubes extending through the cylinders and supported by the partitions, short JAMES R. VANCE.

\Vitnesses:

GEO. F. DITMARS, A. R. WYcKoFF. 

